论文部分内容阅读
我们在硅衬底上制备出厚度在原子尺度上可控、宏观尺度上均匀的铅薄膜。观察到随着厚度一个原子层一个原子层增加时薄膜超导转变温度的振荡现象。我们证明,这种振荡行为是量子尺寸效应的结果。在这种薄膜中,电子德布罗意波的干涉行为类同于光的法布里 玻罗干涉,会导致量子阱态的形成。量子阱态的形成改变了费米能级附近的电子态密度和电声子耦合强度,从而最后导致了超导转变温度的变化。研究结果表明:通过精确控制这种厚度敏感的量子尺寸效应,可以调制材料的物理和化学性质。
We fabricated lead films with controlled thickness and uniform macroscopically on the silicon substrate. It is observed that the oscillation of the superconducting transition temperature of the film increases as the atomic layer of an atomic layer increases in thickness. We show that this oscillatory behavior is the result of the quantum size effect. In this kind of film, the electronic de Broglie wave interference acts like the Fabry-Perot interference of light, which leads to the formation of quantum well states. The formation of the quantum well state changes the electronic density of states near the Fermi level and the electro-phonon coupling strength, which eventually leads to the change of the superconducting transition temperature. The results show that by precisely controlling this thickness-sensitive quantum size effect, the physical and chemical properties of the material can be modulated.